Mozilla Foundation Security Advisory 2013-80

NativeKey continues handling key messages after widget is destroyed

Announced

September 17, 2013

Reporter

Masayuki Nakano

Impact

Moderate

Products

Firefox, SeaMonkey, Thunderbird

Fixed in

Firefox 24

SeaMonkey 2.21

Thunderbird 24

Description

Mozilla developer Masayuki Nakano discovered that the
NativeKey widget continues handling key messages even when it is
destroyed by dispatched event listeners. This could result in some key events
being applied to other objects or plugins if the widget memory is reallocated to
them, leading to a non-exploitable crash.

In general this flaw cannot be exploited through email in the
Thunderbird product because scripting is disabled, but is potentially a risk in
browser or browser-like contexts.